It shows what Hapgood claims were different locations
of the North pole within the last 100,000 years or so. The chart (in
condensed form) also shows the standard geological names for changes
in ice sheet positions, such as advances, and the climate changes
that resulted. Hapgood derived some of his conclusions about pole
shifts from that evidence.

Having the entire chart in one place so you can scan
up and down it instead of having to change pages should be an
advantage.

By 'interstadial' Hapgood means a short period of
relative warmth and ice recessing during a glacial period.